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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0001a7e8e7959a8646582f960ff72945f22151fff583b4989214e4c1b3efc414' 
  AND token = 'tbl8T5hqypqmHNkBxeRjf2XvrGqCRDP2rr2+zyprTGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}